<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    {{ msg }} - {{ msg.split('').reverse().join('') }} --- {{ 1+ 1}}
    {{ flag ? '真' : '假' }}
  </div>
</body>
<script src="lib/vue.js"></script>
<script>
  new Vue({
    el: '#app',
    data: {
      msg: 'hello world',
      flag: true
    }
  })
  
</script>
</html>